Home / 20,385.82-28,120.48-12,820.15

Finding the Fourth Proportional to 20,385.82, 28,120.48 and 12,820.15

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Solution

The fourth proportional to 20,385.82, 28,120.48 and 12,820.15 is: 17,684.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,385.82 : 28,120.48 = 12,820.15 : x
  2. Step 2: Convert to fraction form
    20,385.82/28,120.48 = 12,820.15/x
  3. Step 3: Cross multiply
    20,385.82x = 28,120.48 × 12,820.15
  4. Step 4: Simplify right side
    20,385.82x = 360,508,771.67
  5. Step 5: Solve for x
    x = 360,508,771.67/20,385.82
  6. Step 6: Final answer
    x = 17,684.29

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.